Browsing by Author "Smrity Dwivedi"

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A Multiple Millimeter-Wave 5G MIMO Antenna Including n257/n258/n259/n260/n261 FR2-Bands with High Diversity Performance
(Institute of Electrical and Electronics Engineers Inc., 2023) Manish Sharma; Kanhaiya Sharma; Smrity Dwivedi; Dinesh Kumar Singh; Rana Gill; Naresh Kumar
This communication focuses on a two-port MIMOWB configuration wide-bandwidth antenna for future 5G high-speed wireless applications radiating electromagnetic energy. The single-port antenna offers impedance bandwidth of 24.50GHz-41.675GHz for HFSS EM-simulator and 23.63GHz-43.13GHz for CST-Microwave Studio EM-simulator. The square-radiating patch radiating EM-wave with the rectangular slot on top-surface & beveled-ground on the bottom surface of dielectric with permittivity 2.20 and thickness 0.787. Also, the compact dimension of the antenna is 12.0 × 15.0 mm2 and the two-port transformed dimensions are 24.0 × 15.0 mm2. The SFD studying surface-current-distribution (SCD) with directional 2-D radiation patterns in n257, n258, n259, n260, and n261 5G-millimeter wave bands infrastructure. The MIMO antenna also offers averaged peak gain of 4.50dBi with high diversity ECC and DG parameters. © 2023 IEEE.
Beam-wave Interaction Analysis of X-band Gridless Reltron
(Institute of Electrical and Electronics Engineers Inc., 2019) Prabhakar Tripathi; Arjun Kumar; Soumojit Shee; Smrity Dwivedi; P.K. Jain
In this work, particle in cell (PIC) simulation study has been performed to observe the operating characteristics of the highly efficient gridless-reltron in X-band. A 3D PIC code of gridless reltron is designed using CST microwave studio. The RF interaction structure of the Gridless-reltron is a well-known linac structure i.e. side-coupled cavity (SCC). In the reltron, three modes are excited named as 0–mode, π/2–mode and π–mode. The π/2–mode is selected as the operating mode because it is unstable and it grows in amplitude. PIC simulation predicts that the modeled gridless reltron with the beam current of 200 A and a total 250 kV as a tube voltage produces a microwave power of ~13 MW at 8.56 GHz with a pulse width of 3.2 µsec and efficiency of ~26%, in the presence of a relatively low guiding magnetic field of 0.40 T. © 2019 URSI. All rights reserved.